#include <at89c51RC2.h>
#include <INTRINS.H>
void Delay(xms)		//@11.0592MHz
{
	unsigned char i, j;
	_nop_();
	while(xms)
	{
		i = 2;
		j = 199;
		do
		{
			while (--j);
		} while (--i);
		xms--;
	}
}
void main()
{
	while(1)
	{
		P2 = 0x7F;  //0111 1111
		Delay(100);
		P2 = 0xBF;  //1011 1111
		Delay(100);
		P2 = 0xDF;  //1101 1111
		Delay(100);
		P2 = 0xEF;  //1110 1111
		Delay(100);
		P2 = 0xF7;  //1111 0111
		Delay(100);
		P2 = 0xFB;  //1111 1011
		Delay(100);
		P2 = 0xFD;  //1111 1101
		Delay(100);
		P2 = 0xFE;  //1111 1110
		Delay(100);
	}
}